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Because the more you heat up a conductor the more it's electrically resistant. So, when you increase the supply voltage across such a lamp, the current increases as well, but it heats up the filament, which in turn lowers the current.
So, its current depends on 2 variables: voltage and filament temperature.
That's why you find a discrepancy between the resistance you measure with an ohmmeter
and the one you calculate by using its rated power.
Wiki User
∙ 13y ago
Wiki User
∙ 12y agobecause it is a non-ohmic material or something which dos not follows ohms law.thus we get a curve which is linear initially but is curved at the end. hope it helps
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Why is an incandescent lamp cool to the touch when it gives off heat?
An incandescent lamp is not cool to the touch unless it is an extremely low wattage. Heat given off by incandescent lamps is one of the drawbacks of the lamp. Total overall efficiency is reduced by the wasted heat.
What is equal to 60 watt in CFL?
If the question is what wattage compact fluorescent (CFL) lamp has a similar light output to an incandescent lamp of a given wattage, the ratio is usually about 4. A 60W incandescent can be replaced by an 13-15 W CFL lamp. A 60W CFL lamp can replace a 300W incandescent lamp.
Can you use an incandescent light bulb in a full spectrum lamp?
no
Light frequency from an incandescent lamp depends on what?
The peak Frequency
What is the most economical incandescent bulb 10 watts or fluorescent lamp 10 watts and why?
the most economical is the incandescent bulb because the power of bulb is low only while the fluorescent lamp is low and additional the power of ballast from 10%-20% power consumed.but the fluorescent lamp is 5 times brightly the incandescent bulb.
What is nonlinear resistance?
A nonlinear resistance is a resistance which is different for different voltages ie current is not proportional to voltage. An example of this is the filament of an incandescent lamp.
What can an incandescent test lamp is used to check?
An incandescent lamp can be used to check continuity of a circuit.
What light sources emits only a continuous spectrum a. hydrogen gas b. mercury lamp c. sodium lamp d. incandescent lamp e. laser?
d. incandescent lamp
Is CO2 emitted by incandescent bulb?
No, carbon dioxide is not emitted by an incandescent lamp.
Why is an incandescent lamp cool to the touch when it gives off heat?
An incandescent lamp is not cool to the touch unless it is an extremely low wattage. Heat given off by incandescent lamps is one of the drawbacks of the lamp. Total overall efficiency is reduced by the wasted heat.
Why was the incandescent lamp not used in homes?
The incandescent lamps are very frequently used in all the buildings !
Who was rewarded for his patent incandescent lamp?
Alexander Lodygin
Where did Edison invents a practical incandescent lamp?
1859
What was the first name of the light bulb?
The Incandescent Lamp
What is another word for light bulb?
Incandescent lamp
What part of the lamp converts electricity to light?
For a filament-type (incandescent) lamp, it's the filament.
Who invented the gas-filled incandescent lamp in 1932?
Langmuir
